A triolet (UK: as ‘violet’, US: “tree-oh-lay”) is a poem in eight lines, with the first line repeated in lines four and seven, and the second line being repeated as the last line of the poem. There are only two rhymes, and with the repeated lines the pattern for a triolet is: ABaAabAB, where capital letters indicate a repeated line.

See also here and here for more on the triolet. It is a light and playful form, suited to love poems or nonsense. Or both…

Pretty
Oh, what a pretty thing is love!
And so are you.
As pretty as a collared dove
Oh, what a pretty thing is love!
Reminds me of
That blasted bird’s non-stop “hoo-hoo”
Oh, what a pretty thing is love!
And so are you.

I decided to challenge myself by writing uneven lines: 8,4,8,8,4,8,8,4. I find writing regular lines in eights or tens, to be my ‘default setting’, and since the triolet doesn’t specify a line length it seemed a good time to break that pattern.